Povidone Iodine is a light brown colour liquid that loses its colour when the free iodine is exhausted. When the liquid turns colourless it can be discarded, or fresh iodine is added to the solution.

Iodosan is effective at 75 to 25 ppm which is chevied by diluting the liquid in water by 1:10 times. In other words, we can add 900 ml of plain water in 100 ml of the Iodosan to make it an effective virucide.